US4157359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes stabilized against ultraviolet light and nitrogen oxide deterioration
Assignee: Wyeth Holdings LLC
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Filing: 1976-05-26
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Granted: 1979-06-05
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Expires: 1996-05-26
Abstract
Abstract A polyurethane polymer stabilized against the deteriorative effects of ultraviolet light and nitrogen oxides is provided comprising the polymer combined with a stabilizing amount of an aminoplast resin.
Inventors
- 👤 Eugene Y. C. Chang
- 👤 Samuel Kaizerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:15
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/0804; C08G18/70; C08G18/71; C08G18/72; C08G18/80; C08G18/8061; C08G18/807; C08K; C08K5/00; C08K5/16; C08K5/32; C08K5/33; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
100 words
A composition stabilized against the deteriorative effects of ultraviolet light and nitrogen oxides which comprises a polyurethane containing a stabilizing amount of a composition comprising (1) an aminoplast resin, (2) an ultraviolet light absorber comprising a 2-hydroxybenzophenone, a benzotriazole or a benzylidene-malonic ester and (3) a phenolic antioxidant, said polyurethane being the reaction product of a polyurethane prepolymer prepared by reacting a polyether, a polyester of a polyformal polyol with an aromatic diisocyanate and reacting the isocyanate terminated prepolymer thus formed with a low molecular weight compound containing two active hydrogen atoms which display activity according to the Zerewitinoff test.
Claim 2
Dependent Claim
100 words
A composition stabilized against the deteriorative effects of ultraviolet light and nitrogen oxides which comprises a polyurethane containing a stabilizing amount of a composition comprising (1) an aminoplast resin, (2) an ultraviolet light absorber comprising a 2-hydroxybenzophenone, a benzotriazole or a benzylidene-malonic ester and (3) a phenolic antioxidant, said polyurethane being the reaction product of a polyurethane prepolymer prepared by reacting a polyether, a polyester of a polyformal polyol with an aromatic diisocyanate and reacting the isocyanate terminated prepolymer thus formed with a low molecular weight compound containing two active hydrogen atoms which display activity according to the Zerewitinoff test.
Claim 3
Dependent Claim
14 words
The polyurethane according to claim 1 wherein the low molecular weight compound is water.
Claim 4
Dependent Claim
12 words
The polymer according to claim 1 wherein the isocyanate is tolylene diisocyanate.
Claim 5
Dependent Claim
12 words
The polymer according to claim 1 wherein the polyol is a polyester.
Claim 6
Dependent Claim
15 words
The polyurethane according to claim 1 wherein the aminoplast resin is highly methylated methylol urea.
Claim 7
Dependent Claim
22 words
A composition according to claim 1 wherein said (1) is dimethyol ethylene urea, said (2) is 2-(2-hydroxy-3,5-di-t-butylphenyl)-5-chlorobenzotriazole and said (3) is 4,4'-butylidenebis(6-t-butyl-m-cresol).
Claim 8
Dependent Claim
10 words
A composition according to claim 6 wherein (3) is 2,6-di-t-butyl-4-methylphenol.
Claim 9
Dependent Claim
10 words
A composition according to claim 7 wherein (2) is 2,2'-dihydroxy-4-methoxybenzophenone.
Claim 10
Dependent Claim
10 words
A composition according to claim 7 wherein (2) is 2-(2-hydroxy-5-octylphenyl)benzotriazole.
Claim 11
Dependent Claim
86 words
A process for stabilizing a polyurethane from the deteriorative effects of ultraviolet light and nitrogen oxides, said polyurethane being the reaction product of a polyether, a polyester or a polyformal polyol, an aromatic diisocyanate and a low molecular weight compound containing two active hydrogen atoms according to the Zerewitinoff test which comprises adding a stabilizing amount of a composition comprising (1) an aminoplast resin, (2) an ultraviolet light absorber comprising a 2-hydroxybenzophenone, a benzotriazole or a benzylidene-malonic ester and (3) a phenolic antioxidant to said polyurethane.
Claim 12
Dependent Claim
86 words
A process for stabilizing a polyurethane from the deteriorative effects of ultraviolet light and nitrogen oxides, said polyurethane being the reaction product of a polyether, a polyester or a polyformal polyol, an aromatic diisocyanate and a low molecular weight compound containing two active hydrogen atoms according to the Zerewitinoff test which comprises adding a stabilizing amount of a composition comprising (1) an aminoplast resin, (2) an ultraviolet light absorber comprising a 2-hydroxybenzophenone, a benzotriazole or a benzylidene-malonic ester and (3) a phenolic antioxidant to said polyurethane.
Claim 13
Dependent Claim
29 words
The process according to claim 10 wherein the polyol and the diisocyanate are reacted and the resulting polymer is emulsified and the aminoplast resin is added to the emulsion.
Claim 14
Dependent Claim
26 words
The process according to claim 10 wherein the amount of aminoplast resin is from 0.1 to 5 percent by weight of the solids of the emulsion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-04 | 1982-12-04 | 1983-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-04 | 1986-12-04 | 1987-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-04 | 1990-12-04 | 1991-06-05 | $7700.00 | Window Closed / Lapsed |